upload code files and along with code interpreter for LLM analysis

[howieleung]

Description

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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Testing Guidelines

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[Copilot]

Pull request overview

This PR updates the azure-ai-projects sample test harness to optionally upload the sample’s Python source files so LLM validation can use the Code Interpreter tool for deeper analysis, alongside a few related test/sample sanitization tweaks.

Changes:

• Add logic in the sample test executor to discover local imported Python files and (in live mode) upload them for Code Interpreter–enabled responses.create validation; also delete uploaded files after validation.
• Update sanitization/config values used by tests (sanitized model deployment name, assets tag).
• Minor sample prompt text adjustment.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
sdk/ai/azure-ai-projects/tests/test_base.py	Updates sanitized model deployment name used by test env var loader.
sdk/ai/azure-ai-projects/tests/samples/sample_executor.py	Adds local-module file discovery + optional Code Interpreter file upload/delete around LLM validation requests.
sdk/ai/azure-ai-projects/samples/agents/tools/sample_agent_openapi.py	Tweaks the example prompt text used for OpenAPI tool sample.
sdk/ai/azure-ai-projects/assets.json	Bumps assets tag to point at updated recorded assets.